embOS-MPU

embOS-MPU uses the hardware's memory protection unit as well as additional software mechanisms implemented with embOS-MPU to prevent one task from affecting the entirety of the system. This guarantees that even in case a bug occurs in one task, all other tasks and the operating system itself continue execution.

emCrypt

emLib

Internet of Things

Secure, connected, embedded devices build with SEGGER solutions

Software IP components from SEGGER such as emSSL, emSSH, emSecure Crypto libraries, HTTP Web server, and embOS/IP to name a few, can be used as foundations for your securely, connected IoT device. Our software works on any MCU.

Flasher ST7

Flasher ATE

Flasher ATE is an in-circuit-programmer for high volume mass production. The interfaces to start and monitor the programming tasks have been designed with the implementer of the production system in mind.

emWin Antialiasing

Support for antialiasing is a separate software item and is not included in the emWin basic package.

How it works

Lines are approximated by a series of pixels that must lie at display coordinates. They can therefore appear jagged, especially nearly horizontal or nearly vertical lines. This jaggedness is called aliasing. Antialiasing is the smoothing of lines and curves. It reduces the jagged, stair-step appearance of any line that is not exactly horizontal or vertical. emWin supports different antialiasing qualities, antialiased fonts and high-resolution coordinates.

Antialiasing smoothes curves and diagonal lines by "blending" the background color with that of the foreground. The higher the number of shades used between background and foreground colors, the better the antialiasing result (and the longer the computation time).

Resources

Antialiasing Quality

The quality of antialiasing can be set with a factor between 1 and 6, where 1 means no antialiasing and 6 the highest quality. For most applications factor 4 is sufficient and is a good compromise between quality and performance.

Antialiased Fonts

Fonts are available with two levels of antialiasing, low-quality (2bpp) and high-quality (4bpp). The following table shows the effect on drawing the character C without antialiasing and with both types of antialiased fonts.

Antialiased fonts can be created using the Font Converter. The general purpose of using antialiased fonts is to improve the appearance of text. While the effect of using high-quality antialiasing will be visually more pleasing than low-quality antialiasing, computation time and memory consumption will increase proportionally. Low-quality (2bpp) fonts require twice the memory of non-antialiased (1bpp) fonts; high-quality (4bpp) fonts require four times the memory.

Font type

Black on white

White on black

Standard (no antialiasing)1 bpp, 2 shades

Low-quality (antialiased)2 bpp, 4 shades

High-quality (antialiased)4 bpp, 16 shades

High-Resolution Coordinates

When drawing items using antialiasing, the same coordinates are used as for regular (non-antialiasing) drawing routines. This is the default mode. It is not required to consider the antialiasing factor in the function arguments. An antialiased line from (50, 100) to (100, 50) would be drawn with the following function call:

GUI_AA_DrawLine(50, 100, 100, 50);

The high-resolution feature of emWin lets you use the virtual space determined by the antialiasing factor and your display size. The advantage of using high-resolution coordinates is that items can be placed not only at physical positions of your display but also "between" them.

The virtual space of a high-resolution pixel is illustrated beneath based on an antialiasing factor of 3:

To draw a line from pixel (50, 100) to (100, 50) in high-resolution mode with antialiasing factor 3, one would write:

GUI_AA_DrawLine(150, 300, 300, 150);

High-resolution coordinates must be enabled with the routine GUI_AA_EnableHiRes(), and may be disabled with GUI_AA_DisableHiRes(). Both functions are explained later in the chapter. For example programs using the high-resolution feature, see the examples at the end of the chapter.